.hero-video {
    position: relative;
    width: 100%;
    height: 100vh;
    /* full màn hình */
    overflow: hidden;
    left: -1px;
}

.hero-bg-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    object-fit: cover;
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: #fff;
    top: 20%;
    /* transform: translateY(-50%); */
}

.hero-content .title {
    font-size: 44px;
    text-shadow: 0 4px 4px rgba(0, 0, 0, 0.40);

    margin-bottom: 20px;
}

.hero-content .desc {
    font-size: 20px;
    text-shadow: 0 3px 3px rgba(0, 0, 0, 0.55);
    max-width: 417px;
    width: 100%;
    margin-bottom: 24px;
}

.hero-content .btn-style-1 {
    width: fit-content;
    color: #fff;
    text-decoration: none;
    font-weight: 600;
    padding: 0 40px;
}

/* section 2 */
.section-course {
    padding: 40px 0;
    background: url(./images/course_bg_2.png) #F2F5FF 50% / cover no-repeat;
}

.section-course .bg-icon {
    top: 6%;
    left: 15%;
}

#course-search {

    position: relative;
    top: -50px;
    z-index: 99;
}

.course-select-box {
    background: linear-gradient(91deg, #0C58A4 0.49%, #1163B4 50%, #166DC5 99.51%);
    border-radius: 16px;
    padding: 30px 25px;
}

#course-search .row p {
    font-size: 18px;
    line-height: 25px;
    color: #FFD868;
    border-right: 1px solid #FFD868;
    margin-bottom: 0;
    /* padding: 10px 10px 10px 25px; */
}

#course-search .row p {

    font-size: 16px;
}

#course-search .form-course select {
    width: 100%;
    position: relative;
    text-indent: 45px;
    padding-right: 10px;
    width: 100%;
    height: 48px;
    resize: none;
    background-color: #fff;
    border-radius: 60px;
    font-size: 16px;
    outline: none;
    border: none;
    border-right: 20px solid transparent;
    color: #000;
}


#course-search .form-course .icon-form img {
    width: 18px;
    position: absolute;
    top: 15px;
    left: 20px;
    z-index: 1;
    height: 19px;
}

#course-search .form-course .btn-change-option {
    width: 100%;
    height: 48px;
    position: relative;
    text-align: center;
    z-index: 1;
    overflow: hidden;
    line-height: 1;
}

#course-search .form-course .btn-change-option a {
    color: #fff;
    font-weight: 600;

}

.course-item {
    background-color: #fff;
    overflow: hidden;
    border-radius: 10px;
}

.course-item img {
    transform: scale(1);
    transition: all 0.3s;
}

.course-item:hover img {
    transform: scale(1.2);
    transition: all 0.3s;
}

.course-main {
    padding: 10px 16px;
}

.course-content .course-name {
    font-size: 20px;
    color: var(--c-primary);
    font-weight: bold;
    margin-bottom: 12px;
}

.course-content .course-btn {
    border: solid 1px var(--c-primary);
    border-radius: 50px;
    padding: 6px 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    width: fit-content;
    gap: 10px;
    color: var(--c-primary) !important;
    font-weight: 600;
    height: auto;
}

.course-item:hover .course-btn {
    background-color: var(--color-3);
    color: #fff !important;
    border-color: var(--color-3);
}

.course-item:hover .course-btn svg path {
    stroke: #fff;
}

/*  */
.section-course-tabs {
    padding: 60px 0;
    background: url(./images/course_3_bg.png) #fff -0.209px -293.884px / 100.024% 148.148% no-repeat;
}

.course-tabs {
    margin-top: 44px;
}

.course-tabs .nav-tabs {
    border: none;
}

.course-tabs .nav-tabs .nav-link {
    border: solid 1px var(--c-primary);
    border-radius: 50px;
    max-width: 279px;
    width: 100%;
    font-size: 18px;
    color: var(--c-primary);
    margin-bottom: 20px;

}

.course-tabs .nav-tabs .nav-link:not(:last-child) {
    margin-right: 20px;
}

.course-tabs .nav-tabs .nav-link:hover,
.course-tabs .nav-tabs .nav-link.active {
    background-color: var(--c-primary);
    color: #fff;
}

.course-tabs .tab-content {
    margin-top: 40px;

}

.course-tabs .tab-content .box-image {
    padding-left: 50px;
}

.course-tabs .tab-content .box-text {
    display: flex;
    flex-direction: column;
    justify-content: center;
    height: 100%;
}

.course-tabs .tab-content .box-text h2 {
    color: var(--color-4);
}

.course-tabs .tab-content .box-text p em {
    font-size: 20px;
    color: #13235C;
}

.course-tabs .tab-content .box-text ul {
    margin-left: 0;
    list-style: none;
}

.course-tabs .tab-content .box-text ul li {
    font-size: 18px;
    margin-bottom: 17px;
    position: relative;
    color: rgba(24, 24, 24, 0.86);
}

.course-tabs .tab-content .box-text ul li::before {
    content: "";
    background-image: url(./images/icons/checklist.svg);
    width: 27px;
    height: 27px;
    display: block;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: absolute;
    left: -35px;
    top: 0;
}

.course-tabs .course-btn {
    color: #fff;
}

/* Section 4 */
.section-course-register-course {
    padding: 60px 0;
}

.section-course-register-course .bg-icon {
    top: 0;
    left: 40%;
}

.section-course-register-course .box-image .img-inner {
    position: relative;
    padding: 0 25px;
}

.section-course-register-course .box-image img {
    position: relative;
    border-radius: 20px;
    width: 100%;
}



.section-course-register-course .box-image .img-inner::before {
    content: "";
    height: 100%;
    width: 93%;
    background-color: var(--c-primary);
    border-radius: 20px;
    position: absolute;
    left: 34px;
    top: 12px;
    z-index: -1;
}

/* .section-course-register-course .box-text .title {
    color: var(--c-primary);
    font-size: 40px;
    font-weight: 900;
    margin-bottom: 24px;
} */

.section-course-register-course .box-text .desc {
    color: var(--color-5);
    max-width: 578px;
    font-size: 18px;
    margin-bottom: 36px;
}

.section-course-register-course .box-text .btn-style-1 {
    padding: 13px 40px;
    width: fit-content;

}

/*  */
.section-hst {
    padding: 60px 0;
    background-image: url(./images/bg_5_2.png);
    background-repeat: no-repeat;
    background-size: cover;
    background-color: #3855B9;
    overflow: hidden;
}

.section-hst .bg-icon {
    z-index: 1;
}

.section-hst .bg-icon-1 {
    bottom: 0;
    left: 0;
}

.section-hst .bg-icon-2 {
    top: 23px;
    left: 33px;
}

.section-hst .bg-icon-3 {
    right: 3%;
    top: 23px;
}

.section-hst .title {
    margin-bottom: 16px;
    position: relative;
    padding-bottom: 16px;
    z-index: 2;
}

.section-hst .desc {
    font-size: 18px;
    height: 36;
}

.section-hst .title::before {
    content: "";
    background-color: var(--c-secondary);
    width: 112px;
    height: 3px;
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}

.list-hst {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-top: 44px;
    position: relative;
    z-index: 2;
}

.hst-item {
    background-color: #fff;
    border-radius: 15px;
    box-shadow: 0 1px 14px 0 rgba(0, 0, 0, 0.14);
    padding: 24px 32px;

}

.hst-item .icon {
    margin-bottom: 16px;
}

.hst-item h5 {
    margin-bottom: 12px;
}

.hst-item span {
    padding: 5px 20px;
    border: solid 1px var(--c-primary);
    font-weight: 300;
    border-radius: 50px;
    width: fit-content;
    display: block;
    color: var(--c-primary);
}

/*  */
.section-about-casalink {
    padding: 60px 0;
}

.section-about-casalink .box-image {
    padding: 12px;
}

.section-about-casalink .box-image .image {
    border-radius: 15px;
    position: relative;
    z-index: 2;
    width: 100%;
}

.section-about-casalink .box-image::after,
.section-about-casalink .box-image::before {
    content: "";
    background-color: var(--c-secondary);
    width: 89px;
    height: 89px;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
    border-radius: 11px;
}

.section-about-casalink .box-image::after {
    bottom: 0;
    right: 0;
    top: auto;
    left: auto;

}

/*  */
.section-gift {
    padding: 60px 0;
    background-color: var(--color-7);
    overflow: hidden;
}

.section-gift .bg-icon-1 {
    bottom: 0;
    left: 0;
    ;
}

.section-gift .bg-icon-2 {

    left: 45px;
}

.section-gift .bg-icon-3 {
    bottom: 0;
    right: 0;
    ;
}

.list-gift {
    display: grid;
    gap: 25px;
    grid-template-columns: repeat(4, 1fr);
    margin-top: 60px;
}

.gift-item {
    background-color: #fff;
    border-radius: 15px;
    padding: 36px 25px;
    box-shadow: 0 0 12px 0 rgba(0, 0, 0, 0.12);

}

.gift-item .box-icon {
    margin-bottom: 32px;
}

.gift-item .box-text .title {
    margin-bottom: 21px;
    text-transform: capitalize;
    color: var(--color-5);
}

.gift-item .box-text .bg-btn {
    background-color: var(--color-3);
}

.gift-item .box-text .btn-style-1 {
    color: #fff;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
}

/*  */
.section-su-gia {
    padding: 60px 0;
}

.section-su-gia p.desc {
    font-size: 18px;
}

.slide-giangvien {
    margin-top: 40px;
}

.gv-item .thumb {
    margin-bottom: 14px;
    padding: 10px;
    position: relative;
}

.gv-item .thumb .inner-thumb {
    padding: 20px;
    border-radius: 100%;
    position: relative;
}

.gv-item .thumb .inner-thumb img {
    border-radius: 50%;
}

.gv-item .thumb .inner-thumb::before {
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-size: cover;
    background-repeat: no-repeat;
    background-image: url(./images/gv_frame3.png);
    transform: rotate(0deg);
    transition: all 0.3s;

}

.gv-item .thumb .inner-thumb::after {
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-size: cover;
    background-repeat: no-repeat;
    background-image: url(./images/gv_frame4.png);
    transform: rotate(90deg);
    transition: all 0.3ms;
    opacity: 0;
}

.gv-item:hover .inner-thumb::before {
    transform: rotate(180deg);
    opacity: 0;
    transition: all 0.3ms;
}

.gv-item:hover .inner-thumb::after {
    transform: rotate(180deg);
    opacity: 1;
    transition: all 0.3s;

}

/* .gv-item .thumb .inner-thumb::after,
.gv-item .thumb .inner-thumb::before {
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-size: cover;
    background-repeat: no-repeat;
} */

/* .gv-item .thumb .inner-thumb::after {
    background-image: url(./images/Ellipse6.png);

}
.gv-item .thumb .inner-thumb::before {
    background-image: url(./images/Ellipse7.png);

} */

.gv-item .title {
    color: var(--color-5);
    font-weight: 600;
}

.gv-item .vtgv {
    color: var(--c-primary);
    font-size: 18px;
    margin-bottom: 14px;
}

.gv-item .desc {
    color: var(--color-5);
}

/* section 9 */
.section-hoc-vien-tieu-bieu {
    background-color: #EDF1FF;
    background-image: url(./images/bg_9.png);
    background-size: contain;
    background-repeat: repeat;
    padding: 60px 0;
    position: relative;

}

.section-hoc-vien-tieu-bieu::after {
    content: "";
    background-image: url(./images/icons/icon-book.png);
    width: 119px;
    height: 120px;
    position: absolute;
    z-index: 1;
    bottom: 0;
    right: 0;
}

.list-hvtb {
    margin-top: 44px;
    padding: 0 15px 15px;
}

.hvtb-item {
    padding-top: 65px;
}

.hvtb-inner {
    box-shadow: 0 1px 10px 0 rgba(0, 0, 0, 0.16);
    border-radius: 10px;
    background-color: #fff;
}

.hvtb-item .thumb {
    background-color: var(--c-primary);
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    position: relative;
    padding-top: 100px;
    padding-bottom: 5px;
}

.hvtb-item .inner-thumb {
    max-width: 125px;
    height: 125px;
    border-radius: 50%;
    overflow: hidden;
    position: absolute;
    top: -65px;
    left: 50%;
    transform: translateX(-50%);
}

.hvtb-item .content {
    padding: 20px;
}

.hvtb-item .content .desc {
    color: var(--color-5);
    font-size: 18px;
}

/* section 10 */
.section-phan-hoi {
    padding: 40px 0;

}

.list-reviews-hv {
    margin-top: 40px;
}

.section-phan-hoi .box-hv-reviews .inner-container {
    background-image: url(./images/review-bg.png);
    background-repeat: no-repeat;
    background-size: contain;
    padding: 80px 0 140px 0;
    background-position: center;
    position: relative;
}

.box-hv-reviews .inner-container::after {
    content: "";
    width: 60px;
    height: 61px;
    background-image: url(./images/icons/shape-2.png);
    position: absolute;
    bottom: 8%;
    right: 12%;
    z-index: 1;
}

.hv-review-item {
    max-width: 890px;
    width: 100%;
    margin: auto;
}

.hv-review-item .thumb {
    display: flex;
    align-items: center;
    gap: 19px;
    justify-content: center;
    margin-top: 30px;
}

.hv-review-item .box-title .title,
.hv-review-item .box-title span {
    color: var(--color-5);
}

.hv-review-item .thumb .inner-thumb {
    max-width: 91px;
    height: 91px;
    border-radius: 50%;
    overflow: hidden;
}

.hv-review-item .content {
    font-size: 20px;
}

.box-hv-reviews .swiper-pagination {
    bottom: 35px !important;
}

.box-hv-reviews .swiper-pagination-bullet {
    height: 12px;
    width: 12px;
    background-color: #4469BE;
    margin: 0 6px;
}

.box-hv-reviews .swiper-pagination-bullet-active {
    background-color: #4469BE;
    outline: #4469BE;
    outline-style: solid;
    outline-offset: 3px;
    outline-width: 3px;
    padding: 5px;
    border: solid transparent 2px;
}

.box-ph-reviews {
    padding: 40px 0;
}

.list-reviews-ph {
    margin-top: 46px;
}

.ph-review-item {
    padding: 10px;

}

.ph-review-item .ph-review-inner {
    border-radius: 20px;
    background: #FFF;
    box-shadow: 0 6px 12px -4px rgba(0, 0, 0, 0.12);
    padding: 24px;
}

.box-ph-reviews .desc {
    max-width: 88%;
    margin-left: auto;
}

.ph-review-inner .desc {
    max-width: 100%;
    margin-left: 0;
    font-size: 18px;
}

.ph-review-inner .thumb {
    margin-bottom: 24px;
}

.ph-review-inner .inner-thumb {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    overflow: hidden;
}

.list-reviews-ph .swiper-button-next {
    right: -50px;
    left: auto;
}

.list-reviews-ph .swiper-button-prev {
    left: -50px;
    right: auto;
}

.list-reviews-ph .swiper-button-next,
.list-reviews-ph .swiper-button-prev {
    width: 36px;
    height: 36px;
    background-color: #EDF7FF;
    outline: #E1E8FF;
    outline-style: solid;
    outline-offset: 0px;
    outline-width: 3px;
    padding: 5px;
    border-radius: 50px;
}

.list-reviews-ph .swiper-button-next::after,
.list-reviews-ph .swiper-button-prev::after {
    font-size: 16px;
    color: #0F75DC;
    font-weight: 900;
}

/* Section 11 */
.main-homebox9 {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    justify-content: space-between;
}

.main-homebox9 .col-item {
    width: 35%;
}

.main-homebox9 .col-item:not(.col-item-center) {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    grid-gap: 10px;
}

.main-homebox9 .col-item.col-item-center {
    width: 28%;
}

.main-homebox9 a {
    display: block;
    border-radius: 10px;
    overflow: hidden;
}

.main-homebox9 .col-item-right a:last-child,
.main-homebox9 .col-item-left a:first-child {
    grid-column: 1 / 3;
}

.main-homebox9 img {
    width: 100%;
    display: block;
    height: 100%;
    object-fit: cover;
    border-radius: 15px;
}

.main-homebox9 .col-item-right a:last-child img,
.main-homebox9 .col-item-left a:first-child img {
    aspect-ratio: 461 / 241;
}

.main-homebox9 .col-item:not(.col-item-center) img {
    aspect-ratio: 222 / 214;
}

.main-homebox9 .col-item-center img {
    aspect-ratio: 314 / 417;
}

/* section 12 */
.section-lienhe .inner-container {
    padding: 40px 0;
    border-radius: 40px;
    background: linear-gradient(261deg, #234DE0 2.69%, #234DE0 97.31%);
    margin-top: 40px;
}

.section-lienhe .bg-icon {
    bottom: 0;
    right: 0;
}

.form-tuvan {
    max-width: 800px;
    width: 100%;
    margin: auto;
    margin-top: 30px;
    position: relative;
    z-index: 2;
    padding: 0 10px;
}

.form-tuvan input,
.form-tuvan select {
    width: 100%;
    height: 50px;
    border: solid 1px rgba(255, 255, 255, 0.96);
    border-radius: 8px;
    padding: 0px 23px;
    background: transparent;
    color: #fff !important;
}

.form-tuvan input::placeholder,
.form-tuvan textarea::placeholder {
    color: #fff;
}

.form-tuvan select option {
    color: #000;
}

.form-tuvan textarea {
    border: solid 1px rgba(255, 255, 255, 0.96);
    border-radius: 8px;
    padding: 12px 23px;
    background: transparent;
    color: #fff !important;
}

.form-tuvan input:focus-visible,
.form-tuvan textarea:focus-visible,
.form-tuvan select:focus-visible {
    outline: none;
    box-shadow: none;
}

.form-tuvan input[type="submit"] {
    border-radius: 9px;
    background: linear-gradient(180deg, #FF4D53 0%, #CA3438 100%);
    border: none;
    font-weight: 600;
    font-size: 18px;
}

/* responsive */

@media screen and (max-width:768px) {
    .hero-content .title {
        font-size: 38px;
    }

    #section-2.section-course .container .choose-course .row p {
        border: none;
    }

    .form-course {
        margin-top: 20px;
    }

    .form-course .row>div {
        margin-bottom: 10px;
    }

    .list-courses .swiper-container {
        padding-bottom: 40px;
    }

    .list-courses.box-pd-50 {
        padding: 0;
    }

    .course-tabs .nav-tabs {
        gap: 10px;
    }

    .course-tabs .nav-tabs .nav-link:not(:last-child) {
        margin-right: 0;
    }

    .course-tabs .tab-content .box-image {
        padding-left: 0;
        margin-bottom: 20px;
    }

    .section-course-register-course .box-image {
        margin-top: 30px;
    }

    .section-course-register-course .box-image .img-inner {
        padding: 0;
    }

    .section-course-register-course .bg-icon {
        display: none;
    }

    .section-about-casalink .box-videos {
        margin-top: 20px;
    }

    .list-reviews-ph .swiper-button-next,
    .list-reviews-ph .swiper-button-prev {
        display: none;
    }

    .list-hst {
        grid-template-columns: repeat(2, 1fr);
    }

    .gv-item .thumb {
        max-width: 248px;
        width: 100%;
        height: 248px;
        margin: auto;
    }

    .section-gift {
        padding-bottom: 150px;
    }

    .section-gift .bg-icon-3 {
        bottom: -3px;
        right: -2px;
    }

    .list-gift {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-lienhe .bg-icon {
        display: none;
    }

    .section-phan-hoi .box-hv-reviews .inner-container {
        background-size: cover;
        border-radius: 48px;
        overflow: hidden;
    }

    .hv-review-item .content {
        font-size: 16px;
    }
    .list-reviews-ph{
        margin-top: 20px;
    }

    .box-ph-reviews .desc {
        max-width: 100%;
        margin-left: 0;

    }
}

@media screen and (max-width:425px) {

    .section-hst .bg-icon-2 {
        left: -20%;
        top: 6%;
    }

    .section-hst .bg-icon-3 {
        right: -11%;
        top: 17%;
    }



    .section-gift .bg-icon-2 {
        left: 45px;
        width: 12%;
        top: 7px;
    }



    .list-hst,
    .list-gift {
        grid-template-columns: repeat(1, 1fr);
    }

    .main-homebox9 .col-item,
    .main-homebox9 .col-item.col-item-center {
        width: 100%;
    }

    .main-homebox9 .col-item.col-item-center {
        margin: 10px 0;
    }
}